A child is born with Edwards Syndrome (Trisomy 18). Gene Z is located on chromosome 18. Which parent and which phase of meiosis did the nondisjunction event occur in? Dad: Z¹Z² Mom: Z²Z³ Child: Z²Z³Z³ a. Mom ; Meiosis I b. Dad; Meiosis I c. Dad; Meiosis II d. Mom ; Meiosis II